The body is made of synthetic fibre.  The key feature is a full metal gearbox which provides smooth work and great performance. The JG G39c can go between semi and fully automatic with the flip of a switch. The foldable stock and adjustable hop-up allow for ease of use and quick reloading. The gun contains an adjustable rear sight for aiming and tactical railing. The 470-shot capacity will allow you to shoot for a long time between reloads. Product Details: Fire Selector: Safe, Semi-Auto, Full Auto Magazine Capacity: 470 Rounds low Capacity  Feet Per Second (FPS): 340 - 350fps (Using 0.20g BBs) Recommendations: Nuprol - Battery 8.4v 1600mAh Construction: Mostly Polymer Hop-Up: Adjustable behind mock Bolt Cover Gearbox Version (GBV): 3 Length: 500 - 720mm  Other Features: Flip-up Front and back Ironsight Functional Mock Charging Handle and Bolt Cover Package Details: JG G36C AEG Battery Charger Magazine Cleaning rod Instruction Manual